So I have not updated my iphone for a very long time I'm currently on iOS 4.3.5. If I update it will the lock screen look different?
I mostly just do not want text message previews on
(sorry if that sounds confusing)

So I have not updated my iphone for a very long time I'm currently on iOS 4.3.5. If I update it will the lock screen look different?
I mostly just do not want text message previews on
(sorry if that sounds confusing)

Wrong. The lockscreen will be different. There will be a camera-access slider to the right of the slide to unlock bar, which wasn't there on 4.3.5.

Text messages preview can be turned "off" under the notification settings as usual.

Not to sound rude, but why are u obsessing over text messages?? Why would u think that after u update text & iMessages wouldn't function properly? I'm confused as to why ur worrying about something that is such a non issue. Of course it'll work exactly the way it should.